MARSHALL ASH, J. Uniqueness for higher dimensional trigonometric series. CUBO, A Mathematical Journal, [S. l.], v. 4, n. 2, p. 93–121, 2002. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1786. Acesso em: 20 may. 2024.